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Speedo Fastskin FSII Jammer swimsuit is the one of the most advanced and lowest drag racing swimwear in the world to date! The Fastskin Jammer fabric mimics the rough shark denticles to reduce drag in key areas of the body. The fabric compresses the body to stop skin vibration and muscle oscillation to save energy and reduce drag. Fabric: 81% nylon/19% Lycra Spandex.